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It has been considered why it is possible to inject the local anaesthetic into a vessel even though the previous aspiration-test for blood had a negative result. To avoid an intravasal injection it is to be recommended to interrupt the injection with 15-20 further aspiration tests.

Due to the muscular attachments of the hyoid bone to the posterior part of the base of the skull, and the larynx to the sternum, the larynx will be pressed posteriorly against the vertebral column if the head is kept in a reclined position. This causes a greater resistance when trying to open the hypopharynx with the esophagoscope. If, however, the head is… (More)